Not uncommon: That local reaction is quite common and is actually the most common side effect after immunization. In a way, it's good as it shows the body recognizes the vaccine as something it needs to build an immune response to, and that is the idea of vaccines . Put a cool wash cloth on the area 10 minutes each hour while awake to help decrease swelling. If area gets lots bigger in next days, then see doc.
Answered 9/14/2018
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